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Divestitures - Additional Information (Details) $ in Thousands |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 07, 2019 USD ($) | Jul. 31, 2017 USD ($) MinorityOwner | Dec. 24, 2014 USD ($) | Aug. 31, 2018 USD ($) | Jun. 30, 2018 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 16, 2015 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Gain on sale of other assets |  |  |  |  | $ 2,883 | $ 2,883 |  |
Kingstone Shanghai |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Equity method investment, fair value |  |  |  |  |  |  |  | $ 2,700
Equity method investment, carrying value |  |  |  |  |  |  | $ 2,600 |
Kingstone Hong Kong |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  |  | 15.00%
Proceeds from sale of business |  |  |  | $ 5,700 |  |  |  |
Gain on sale of other assets |  |  |  |  |  | $ 2,900 |  |
Agreement |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Extinguishment of debt |  | $ 2,400 |  |  |  |  |  |
SoLayTec |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  | 51.00% |  |  |  |  |
Purchase price |  |  | $ 1,900 |  |  |  |  |
Number of minority owners involved in Exit Agreement | MinorityOwner |  | 2 |  |  |  |  |  |
Noncontrolling interest |  | $ 2,700 |  |  |  |  |  |
Gain on discontinued operations | $ 1,600 |  |  |  |  |  |  |

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